evan always wanted to help on the cases his uncles worked ; and more than that , he wanted to impress them . unfortunately , his curiosity put him in the wrong place , at the wrong time , landing him with a hospital - worthy injury .
“ he’ll need a blood transfusion .” the nurse sighed as she entered the room , looking at castiel . “ unfortunately , we don’t have any o negative blood at the moment…do you know what blood type you are ? if not , I can check , and if it’s also o negative , we can give it to evan .”